ClassicUI is an addon that attempts to bring back the classic default WoW interface that has been heavily modified in Dragonflight.
Blizzard has updated the default World of Warcraft HUD and UI with the Dragonflight pre-patch, leaving players with no options to return back to the old UI… until now!
ClassicUI is an ambitious project which attempts to recreate the UI as it was back then. You can download ClassicUI here. Below is a screenshot of the UI.